In a food processor or blender, combine one-quarter of the onion, the garlic, lime juice, cumin and salt. Process to a smooth paste. Place the skirt steak in a non-aluminum baking dish. Using a spoon, smear the marinade over both sides of the skirt steak. Cover and refrigerate for at least 1 hour or up to 8 hours. (not more than 8 hours!)

Remove the steak from the marinade. Oil the steak well on both sides and lay it over the hottest part of the grill. Grill, turning once, until richly browned and done to your liking, about 1½ to 2 minutes per side for medium-rare.

*DISCLAIMER*: The information contained in or provided through this site section is intended for general consumer understanding and education only and is not intended to be and is not a substitute for professional advice. Use of this site section and any information contained on or provided through this site section is at your own risk and any information contained on or provided through this site section is provided on an "as is" basis without any representations or warranties.